Machine for threading screws.



F. W. RUDD;

MACHiNE FOR THREADING SCREWS.

APPLICATION FILED AUG.22. 1916. 9 lPfiLtGIltBfl Jan. 15,1918,

3 SHEETS-SHEET I.

F. W. RUDD.

MACHINE FOR THREADING SCREWS. mwucmou 'mcn AUG-2 2, 1916.

mm Jan. 115, 1918.

3 SHEETS-SHEET 2- witness F. W. RODD.

MACHINE FOR THREADING SCREWS.-

APPLICATION FILED Aus.22. 19H).

3 SHEETS-SHEET 3.

. I Jnvenfoz /6 fiTWfimdaf Patented Jan. 15, 1918.

FBEDRICK W. 3.0101), 015 CLEVELAND, OHIO.

Specification of Letters Patent.

Patented Jan. i l-5', 191th.

Application filed August 22, 1916. Serial No. 1.163%.

To all whom it may concern:

Be it known that I, F REDRICK W. Rom), a citizen of the United States of America, residing at Cleveland, State of Ohio, United States of America, have invented new and useful Improvements in Machines for Threading. Screws, 'of which the following is a specification.

The invention to be hereinafter described relates to machines for threading screws.

In order to more clearly disclose theconstruction, operation, and use of the invention, reference should be had to the accompanying drawings forming part of the present application. Throughout the several figuresof the drawings like reference characters designate the sameparts.

In the drawings Figure 1 is a top plan view of the machine with hopper and feeding devices omitted;

Fig. 2 is a cross section on line 2-=2 of Fig. 1, looking in the direction ofthe arrows;

Fig. 3 is an enlarged top plan View of the finger arm with back stop applied;

Fig. 4 is a cross section on line 4-4 of Fig. 1, looking in the direction of the arrows;

Fig. 5 is a front view of the'back rest arm, showing its adjustment;

Fig. 6 is an end view showing the mounting of the pointing tool; and

Fig. 7 is a side elevation ofthe same.

The main objects oftthe inventionare to make machines of this general type more efficient, and more economical; to render them less liable to get out of order; and to eliminate the waste dueto imperfect or in complete operation-of one ormore parts of the machine.

The general type of machine is, admittedly, well known. To accomplish the objects above stated several ofthe parts of the machine have been improved either 1individually, or incomloinationwith cooperating parts, or both, and severaltotally new elements have'been added. These all enter into the general mechanism of the machine 1 :1 and cooperate toward itsfinal result.

' The: spindle-with itsblank clamping jaws andejector, the 'meansfor driving the spin dle-and for operating the jaws, the threading tool post. and its shaft,t.and the mecha .1 nismfor operating it,x the.=-;tormer.plate and its adjustment, the cam shaft, and then gearing train for transmitting the power from the spindle to the several driven shafts, at the desired ratios, are all as in well known machines of this class and it is not thought necessary to further describe them here.

Referring to the drawings in detail,.1indicates the well known finger arm and cup or. carrier arm shaft. Instead of having only a limited rocking movement in its heatings, as in the standard machines, it has, also, a limited sliding longitudinal movement, effected by means of a. cam 2 onthe regular cam shaft, cooperating with an arm 3 fixed to shaft 1. This cam is really a circular plate or disk, having one inclined-or cam face-which engages arm3 and forces it, gradually, toward the hopper end of the machine. A coil spring l exerts a pulling action in the opposite direction. At a determined point in the edge of the cam is made the usual. small notch to effect the picking up operation in the usualand well known way. This is followed by a deep broad" gap 5. A. tension rod 6 is loosely pivoted at one end to a short post 7 which is securely clamped to shaft 4:. The loosepivot connection is adapted to permit relative twisting movement of the tension arm and post. The

opposite end of rod 6 is slidaloly mounted in an opening in a supporting post Sfixed to the frame of the machine. The diameter of the opening is slightly greater thanthe diameter of rod 6 to allow a certain amount of lateral and vertical movement of the tension rod'relatively to the post 8. Between posts 7 and 8 on rod 6 is disposed a tension spring 9 which acts, alwaysgto forceithe shaft 1 to turn toward picking position. The arm 3, asshown in Fig. 2 travelsx in contact with the edge of'the cami2, thnsl counteracting the tendency of the tension spring 9, until. the picking notch is reached. Then the tension spring effects the picking. Then the arm 3 will drop into the gaprx5.

During this movement, spring 9 forces shaft! lengthwise to. place the screw blanlc between? the ijawsof the spindlehead. .Cuparm. 1-3, isc'onnected by a 151111 113 to, the-strap 123 which is: slidaloly. keyed to the shaft 1.

- erably, slightly dished or concaved, all as clearly shown in Figs. 2 and 3. A set screw 11 is used to bind it in any desired adjusted position. This adjustment adapts the stop for use with blanks of various lengths. If desired, the same form of stop may be rigidly secured to the finger arm. It will work equally well whether adjustable or not, when only one length of blanks is to be used, as will be evident. Now, as the arm 3 rides out of the gap 5, the fingers will be lifted to their highest position, and, at the same time, the tapered or incline cam face will start the return longitudinal movement of shaft 1. For these several operations it' is necessary, of course, to have the arm 3 travel in continuous engagement both with the edge of the cam 2 and its incline face. Consequently, the arm 3 is provided with an ear or extension 12 which projects inwardly beyond the edge of the cam and engages the incline face.

Provision must be made for the sliding movement of shaft 1, relatively to the clamp or socket of the cup arm, of course, as the cup arm and'its connected parts can not have such longitudinal movement. Accordingly, this clamp or socket is slidably keyed to the shaft 1, as indicated in dotted lines in 1.

In the present machine, the pointing tool is designed to do nothing but pointing work and, therefore, may be made simple and durable. It is simply a bar 13, properly ground and pointed and adjustably mounted in a tool holder 14 which is reciprocably mounted in a housing 15 bolted or otherwise remo ably secured to a vertical member 16 of the frame. The sliding connection between the tool block and its housing is a dove tail or mortise and tenon. To the rear of the tool 1 block 14, is pivotally connected a rod 17 tool block, is connected one end of the usual lever 20 for actuating the pointing tool. The lever 20 is operated, in one direction by a cam 21, as usual, a spring 22 connected at'its opposite ends, respectively, to the sleeve and lever, acting to maintain contact between the lever and cam, also, as usual. The tool block slide or housing may be adjusted on the member-16, toward or from the spindle, by

the bolt 23 which passes through an elongated slot 2d in the slide and is threaded into the member 16see Figs. 1 and 6.

In order to accommodate blanks of varying lengths in the same back rest, arm 25 is made adjustable, longitudinally, with relation to the spindle. F or this purpose, the

lower or pivot end is mounted between two pivot bolts 26 threaded through ears 27 on the baseof the back rest bracket and considerably spaced apart. By adjusting these pivots, the back rest may be moved toward or from the spindle, as desired, as will be evident. The back rest is moved toward and from operative position in the usual manner, by cooperating cam, lever, and sliding wedge. The wedge baris mounted to have a limited amount of lateral movement in its bracket, toward or from the back rest arm, a small plate 28 removably secured across the bracket face serving to retain it in place. To take. up wear on the wedge or to adjust it to properly position the back rest, an adjusting wedge plate 29 .is used. This fits in the bracket channel behind the wedge bar and has a very gradual taper to permit a fine adjustment of the wedge bar, laterally. To move the wedge bar outwardly, it-is only necessary to loosen the set screw 30 and tap the upperend of wedge plate 29, driving it down and crowding the wedge bar forward.

Or to allow the wedge bar to drop farther into its. bracket channel, it isonly necessary to loosen the set screw, raise wedge platebrackets or bearings of the machine frame.

This permits longitudinal adjustment of the former plate post. ,Oneend of this rock shaft is reduced and near this reduced portion provided with two ears or lugs 31 ex-- tending substantially parallel with the reduced part. On this reduced end, and between lugs 34, isjournaled the cut cam lever 35, cooperating in the-usual way with the cut cam 36. The journal end of this lever is provided with a lug-37 which lies between but spaced from the lugs 34. A. wing bolt 38 passed freely through one lug 34, threaded into and through thelug 37, andbearing against the other 1115134, serves to regulate the euteam lever with regard to thecut cam and the rock shaft.

7 Except as above set forth, the general operation of the machine is well understood and it is not thought advisable to further extend the descriptionto include it.

Changes may bemade in the construction, arrangement, and'disposition of the several parts of the invention, within the limits of the appended claims, without in any way departing from field and scope of the invention, and it is meant to include all such within this application wherein only a pre ferred form has been disclosed.

Having thus described my invention, what I claim and desire to protect by Letters Patent is 1. In combination with a screw threading machine, a longitudinally slidably and rockably mounted cup arm and finger arm shaft, a finger arm fixed thereto, a cup arm slidably keyed thereto, cam and lever devices for sliding said shaft longitudinally, means for rocking said shaft, and spring means for returning said shaft longitudinally after the rocking movement.

2. In combination with a screw threading machine, a cup arm and finger shaft, a cup arm slidably keyed thereto, a finger arm fixed to said shaft, means for sliding said shaft longitudinally, and means for rocking said shaft.

3. In combination with a screw threading machine, a finger arm shaft, a finger arm fixed thereto, an arm fixed to said shaft and provided with an car, an actuating cam engaging said arm and ear to effect both a rocking movement and a sliding movement of the aforesaid shaft in one direction, and means for effecting a sliding movement of said shaft in the opposite direction.

4. In combination with a screw threading machine a back rest bracket, a back rest arm mounted therein, and means for adjusting said arm relatively to said bracket longitudinally toward and from the spindle of the machine to accommodate blanks of varying lengths.

5. In combination with a screw threading machine, a back rest bracket, a back rest arm adjustably mounted therein and means for adjusting said back rest arm relatively to said bracket.

6. In combination with a screw threading machine, a back rest bracket, provided with ears, pivot bolts adjustably mounted in said ears, and a back rest arm pivotally supported by and between said pivot bolts.

7 In combination with a screw threading machine, a back rest bracket, a back rest arm pivotally mounted therein, a wedge bar vertically slidably and laterally adjustably mounted in said bracket and adapted to actuate said back rest arm to operative position, means for adjusting said wedge bar laterally, and means for reciprocating said wedge bar vertically.

8. In combination with a screw threading machine, a back rest bracket, a back rest arm. pivotally mounted therein, a wedge bar vertically slidably and laterally adjustably mounted in said bracket and adapted to actuate said back rest arm to operative position, means for adjusting said wedge bar laterally, a lever, connections between said lever and said wedge bar for actuating said bar, and a cam for actuating said lever.

9. In combination with a screw threading machine, a back rest bracket, a back rest arm pivotally mounted therein, a wedge bar ver tically slidably and laterally adjustably mounted in said bracket and adapted to actuate said back rest arm to operative position, means for adjusting said wedge bar laterally, a lever, link connections between said lever and said wedge bar for actuating said bar, a cam for actuating said lever in one direction, and a spring for actuating said lever in the opposite direction.

10. In combination with a screw threading machine a tool post shaft, a rock shaft parallel with said tool post shaft and provided with a reduced end, a cut cam lever journaled on said reduced end, and means for adjusting said lever about said reduced end.

11. In combination with a screw threading machine a tool post shaft, a rock shaft parallel with said tool post shaft and provided with one reduced end and parallel. spaced lugs adjacent to said reduced end, a cut cam lever journaled on said reduced end and provided with a lug extending between said parallel lugs; and an adjusting screw passed through one lug of said rock shaft, threaded through the lug of the cut cam lever, and setting against the other lug of the rock shaft.

Signed at Montreal, Quebec, Canada, this 17 day of August 1916.

FREDRIOK W. RUDD.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

